Alarm-control unit



Patented Dec. 9, 1930 I TIES ; UNITE, s

PATEN r OFVFI'QE EDWA D BELLMAN, or ROCKFORD, ILLI OIS ALARM-CONTROL UNIT Application filed November 26, 1928. Serial No. 321,929.

, 10 operate with a wire or thread adapted to be either burned through in case of fire, pushed upon or broken in the event that it is stretched across a window or other opening, or across the wall, etc. Contact is made before the ,15 wire or thread is broken if tampered with by a slight touch thereon.

Further objects are to provide an alarm control unit which is of very simple construction, which may be cheaply manufac- 2 tured, and which is easily applied.

Embodiments of the invention are shown in the accompanying drawings, in which:

Figure 1 shows the form of the unit applied to a string or wire.

Figure 2 is a face view of the unit shown in Figure 1.

Figure 3 is a sectional view on the line 3-3 of Figure 2, drawn to an enlarged scale.

Figure 4 is a view showing the unit ap- 30 plied to a door or window and showing a different form of the unit with one form of alarm system associated with the unit.

Referring to Figures 1, 2 and 3, it will be seen that the unit comprises an insulating block 1, which may be held in place by means of spaced screws 2, and attached to any portion of the building desired. This insulating block is provided with a projecting flange 3. An L-shaped adjustable metal member 4 is secured by means of abolt 5 to the underside of this flange. A coil spring 6 has one arm 7 thereof secured to the outer face or insulating flange 3'by means of a bolt 8.

It is to be noted that the L-shaped member 4 has one portion 9 thereof provided with an aperture 10, through which the other arm 11 of the spring member projects. This .arm 11 terminates in an eyelet 12. Conductors lead from the bolts 5 and 8 to the alarm, system.

In the form shown in Figure 1, the alarm is controlled by means of a thread or wire 13 "which is attached. to the eyelet 12 andextends across the portion to be protected, and is attachedto a screw eye 14. For instance, in

case the device is used to indicate fire, the apparatus may be placed in the upper portion of the room, adjacent the ceiling, or wherever desired, and also may be associatedwith any opening in the house, suchas-a window,xso that the thread or Wire may be broken or (50 touched upon a. forced entry. Obviously, any number of threads or wires may be employed and may be so arranged. that the breaking or touching of any one thread will free the spring arm 11 and allow it to, contact with the member 9. Further, contact with the thread or wire ormember 13 will move the arm 11 and cause it to contact with the member 9. I In other words, any disturbance of thethread or member 13 will 'set ofl 7 the alarm by closing the circuit of'this control unit.

Great flexibility is obtained as to the direction in which the thread maybe run or the direction in which the arm may be moved, by proper adjustment of, the spring, and adjustable member 9.

In the form, shown in Figure 4, the same inventive idea is employed; the insulating block is identicalto that one previously described, and is provided with a flange 3. The member 4isprovided with an apertured portion 9, through which the spring arm 15 projects. This spring, arm is connected to. a coiled portion 16,-whichfmay lie in aplane parallel to that ofthe insulating block 1, as described andas'shown in Figure 4. The other arm of the spring is attached to the bolt 17, as shown in Figure 4. The member 4 is held in place by means of the bolt 18. The 99 bolts 17 and 18 are connected to the alarmsystem in a manner hereinafter to appear.

V In using the device, the eyeleted outer end 19 of the spring arm l5 i's arranged to bear 0,, agalnst a door or window or a thread or Wire attached, such as Indicated by the reference character 20, sothat upon motion of this movable member, the contacts will be closed by the engagement of the spring arm 15 with, the member 9. 100

' tinuously sound.

Any suitable system may be employed in connection with these units. For instance, the bolt 18 may be connected to a conductor 19, and this conductor may lead to one contact of an electric bell 20. The other contact of the electric bell may be connected to a con trol or cut-out switch 21 and from thence to one side of the battery 22.

The other side of the battery is connected through the coils of the electro-magnet 23 to the conductor 24-, leading to'thebolt or terminal member 17. As soon as the terminal members 17 and 18 are bridged by the contact of the spring arm 15 with the member 9, current flows from the battery through the coils 28 of the electro-magnet. This electromagnet may actuate an armature 25, which acts as a latchfor a drop 26. The drop 26 may connect the wire 19 with one side of the battery 22, thus closinga local circuit, including the bell, and causing the bell to con-- Obviously, other types of drop switches may-be employed in. the system, and other alarm devices may be employed in place of the bell.

The switch 21 may be a master switch controlled by key look, as described in my application for burglar alarm and lock, Serial No.

321,930, filed November 26, 1928.

It will be seen that these alarm control units are very simplein construction, are easy'to produce',*and are very easy to apply. They have av Wide variety of uses and may be associated with a threador similar member, or With any members which are adapted to be moved. In practice, I provide a cover as a protector to be placed upon these units that cannot be removed without forming a contact. Although this invention has been described in considerable detail, such description is intended as illustrative rather than limiting, as the invention may be variously embodied and as the scope of such invention is to be determined as claimed.

I claim:

1. An alarm control unit comprising abody portion formed of insulating material and having a'projecting lip, a metal bracket secured to one side of said projecting lip and extending outwardly therefrom and terminating in an apertured end, a spring arm having one end secured to said insulating bracket and having the other end projecting outward- 1y through the aperturein said bracket and terminating in an eyelet.

2. In an alarm control unit, comprising a body portion formed of insulating material and having a longitudinal projecting flange at one end thereof, an L-shaped member having its stem portion adjustably connected to the flange on the insulated body, the lateral portion of said L-shaped member being spaced from the outerextremity of the flange and formed of an aperture, a coil spring member positioned between the lateral port-ion of Illinois.

EDlVARD BELLMAH. 

